<template>
	<view>
		<!-- 使用自定义搜索组件 -->
		<view class="search-box">
		<my-search @click="gotoSearch" > </my-search>
		</view>
		<view class="scroll-view-container">
			<!-- 左侧滑动区 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh+'px'}">
				<template v-for="(item, i) in cateList" :key="i">
					<view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)"> {{item.cat_name}}</view>
				</template>
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view class="right-scroll-view" scroll-y="true" :style="{height: wh+'px'}" :scroll-top="scrollTop">	
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类的标题 -->
					<view class="cate-lv2-title">/{{item2.cat_name}}/</view>
					<!-- 当前二级分类下的三级分类列表 -->
					<view class="cate-lv3-list" >
						
						<view class="cate-lv3-item" @click="goToGoodsList(item3)" v-for="(item3, i3) in item2.children" :key="i3">
							<!-- 三级分类的图片 -->
							<image :src="item3.cat_icon" ></image>
							<!-- 三级分类的文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>	
</template>

<script>
	export default {
		data() {
			return {
				//设备可用高度
				wh:0,
				cateList:[],
				active:0,
				//二级分类列表
				cateLevel2:[],
				scrollTop:0
			};
		},
		onLoad(){
			const sysInfo= uni.getSystemInfoSync()
		
			this.wh = sysInfo.windowHeight-50
			this.getCateList()
			
		},
		methods:{
			//获取分类列表
			async getCateList(){
				const { data : res } = await uni.$http.get('/api/public/v1/categories')
				if( res.meta.status !== 200) return uni.$showMsg()
				this.cateList=res.message
				//e为二级列表赋值
				this.cateLevel2 = res.message[0].children
			},
			activeChanged(i){
				this.active=i
				//重新给二级分类赋值
				this.cateLevel2 = this.cateList[i].children
				this.scrollTop=this.scrollTop === 0 ? 1 : 0
			},
			//跳转商品页面
			goToGoodsList(item){
			
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid='+item.cat_id
				})
				
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container{
		display: flex;
		.left-scroll-view{
			width: 120px;
		
			.left-scroll-view-item {
			background-color: #F7F7F7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
			
			&.active{
				background-color: #FFFFFF;
				position: relative;
				&::before{
					content: ' ';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #C00000;
					position: absolute;
					top: 50%;
					transform: translateY(-50%);
					left: 0;
				}
			}
		}
		}
		
		
	}
	.right-scroll-view{
		background-color: #FFFFFF;
	}
	.cate-lv2-title{
			font-size: 12px;
			font-weight: bold;
			padding: 15px 0;
			text-align: center;
		}
		
	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;
		.cate-lv3-item{
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;
			image{
				width: 60px;
				height: 60px;
			}
			text{
				font-size: 12px;
			}
		}
		}
		.search-box{
			position: sticky;
			top: 0;
			z-index: 999;
		}
	 	
</style>
